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A Polyaniline-based Sensor of Nucleic Acids
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Highly selective and sensitive nucleic acid detection based on polysaccharide-functionalized silver nanoparticles.

Jing-Kun Yan1, Hai-Le Ma2, Pan-Fu Cai2

  • 1The Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China; School of Food & Biological Engineering, Jiangsu University, Zhenjiang 212013, China; Department of Applied Biology & Chemical Technology, State Key Laboratory of Chinese Medicine and Molecular Pharmacology in Shenzhen, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|July 5, 2014
PubMed
Summary

Polysaccharide-functionalized silver nanoparticles offer a new way to detect nucleic acids. This novel fluorescence-sensing platform shows high selectivity for specific DNA sequences, including those from human immunodeficiency virus.

Keywords:
Fluorescent sensing platformNucleic acid detectionPolysaccharideSilver nanoparticles

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Molecular Diagnostics

Background:

  • Nucleic acid detection is crucial for diagnostics.
  • Developing sensitive and selective detection methods remains a challenge.
  • Silver nanoparticles offer unique optical properties for sensing applications.

Purpose of the Study:

  • To develop a novel fluorescence-sensing platform for nucleic acid detection.
  • To utilize polysaccharide-functionalized silver nanoparticles (Oc-AgNPs) for this purpose.
  • To demonstrate the platform's effectiveness using human immunodeficiency virus (HIV) oligonucleotide sequences.

Main Methods:

  • Synthesis of polysaccharide-functionalized silver nanoparticles (Oc-AgNPs) with a 15 nm mean diameter.
  • Utilizing Oc-AgNPs as a fluorescence quencher for dye-labeled single-stranded DNA.
  • Investigating interactions (hydrogen bonding, electrostatic) between Oc-AgNPs and DNA.
  • Testing the system's ability to differentiate complementary and mismatched DNA sequences.

Main Results:

  • Oc-AgNPs effectively absorbed and quenched fluorescence from dye-labeled single-stranded DNA.
  • Strong hydrogen bonding and slight electrostatic interactions were identified as key mechanisms.
  • The system demonstrated high selectivity in differentiating complementary from mismatched nucleic acid sequences.
  • The detection method showed good reproducibility at room temperature.

Conclusions:

  • Polysaccharide-functionalized silver nanoparticles provide a novel and effective platform for nucleic acid detection.
  • The Oc-AgNPs system offers high selectivity and reproducibility for oligonucleotide sequence identification.
  • This approach holds promise for sensitive and specific molecular diagnostics.